The girl Catherine is rebellious and gifted. She is chosen and  recruited by the CIA's Special Agent Training Section. What Catherine  receives is not ordinary agent training, but a complete transformation. After  transformation, she becomes a high-tech new human, code-named "Black  Cat". Since then, Catherine has become the ace killing tool of CIA and  none of her targets can be spared. In a certain mission, Catherine is sent to  work in Hong Kong and she meets Allen, the scientific director of Bird  Sanctuary. The upright and kind Allen makes Catherine......

A new cop gets baptized by fire when bank robbers kill her sweetheart and her senior in front of her and she fails to shoot back. She resolves to become hard and rough, then goes undercover. She's also introspective and philosophical, and soon tires of the betrayals of undercover work. She quits, taking up with Brother Panther, a tough but tender thief. Or has she quit? Her superior, Officer Choi, believes she's investigating Panther. Is she a cop or a thief? At times it seems she's investigating Panther's soul, and her own, not the bank job. Over time, she unravels Panther and Choi's connection, but does she understand Panther's nature, his shadow? Or her own? ...